Hong Kong's massive stockpile of seized ivory could help in the hunt for poachers who are killing tens of thousands of elephants across Africa, a leading US biologist says.

But the scientist, who tracks the poachers by analysing DNA from seized tusks, says local officials are not donating samples fast enough for him to pinpoint the latest poaching hot spots.

"Hong Kong has been, in the past, very co-operative," said Dr Samuel Wasser, director of the University of Washington's Centre for Conservation Biology.

Wasser said he received samples of seizures in Hong Kong in 2006 and 2008 with the help of Interpol's wildlife crime investigators. But requests for samples from the most recent seizures - more than six tonnes of ivory worth almost HK$50 million confiscated by customs in the past three months - have been stalled.

"They are willing to help, but they want to wait for the case to close first before donating," he said. "But the information could be useful for prosecutions. There's a real sense of urgency."

In 2001, Wasser started a genetic map of Africa's elephant populations using dung samples. Since 2002, he has overlaid DNA data extracted from seized tusks onto the map, which shows clusters of poaching activity.

"More often than not, it is repeated poaching in the same areas," he said. "If we get an idea of where the hot spots are, you can attack and choke the trade at the source."

Wasser wants about 150 samples from Hong Kong, all about the size of a US dollar coin and taken from the base of the tusk. "It's just like a criminal database," he said. Using a peanut-sized sample and a freezer mill, the sample is ground into a fine powder, which then shows genetic material needed to create a DNA fingerprint, he explains.

"Samples are very important so we can have an idea of where ivory is being poached," said Bill Clark, Interpol's wildlife crime officer. "Asia needs to work more closely with Africans when a seizure is made."

The Agriculture, Fisheries and Conservation Department was not available for comment.

This article appeared in the South China Morning Post print edition as HK's ivory stockpile may stop poachers

Typical Hong Kong civil service and governement.... from airpolution to treating elderly people with dignity and respect to chasing global environmental criminals - they again and again show an astonishing degree of incompetence...